Our ancestors used to go to under sky at night and calculate their locations on the earth. They built landmarks, detailed maps and learned how to read the stars in the night sky.

GPS tracking systems are well known GPS based applications in daily life. Some applications can run independently, such as navigation, geo-tagging and passive track logger. The other applications have to connect to the complementary web servers as the backend sources of map tiles, local search services, landmarks sharing and routes planning.